Whitespace change to test rietveld cq

NOTRY=true
TBR=ehmaldonado@webrtc.org
BUG=chromium:765148

Review-Url: https://codereview.webrtc.org/3013113002
Cr-Commit-Position: refs/heads/master@{#19843}
diff --git a/tools_webrtc/whitespace.txt b/tools_webrtc/whitespace.txt
index 8f48707..633f233 100644
--- a/tools_webrtc/whitespace.txt
+++ b/tools_webrtc/whitespace.txt
@@ -1,7 +1,7 @@
 You can modify this file to create no-op changelists.
 
 Try to write something funny. And please don't add trailing whitespace.
-Whitespaces are cool, except when they're trailing. They they're kind of
+Whitespaces are cool, except when they're trailing. Then they're kind of
 80s.
 Here's a funny story: What do you call a root beer in a square glass? Beer!
 Holidays are coming, beware! Bought any gifts yet?